The search widens for hot rocks that provide power

Geothermal power projects have seen a surge of investment as countries encourage renewable energy. …

Temperatures in Earth’s core, which starts at 2,890km (1,800 miles) below the surface, can reach 5,400°C, about the same temperature as the surface of the Sun. This heat moves upward over time and molten rock known as magma creeps toward the surface, carrying enormous heat.

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